package lab02.test36;

/**
 * Created by admin on 2017/11/9.
 */
public class Postgraduate extends Student {
    @Override
    String calGrade(){
        String grade="";
        double avg=average();
        if (avg>=90&& avg<=100)
            grade="优秀";
        else if (avg>=80&& avg<90)
            grade="良好";
        else if (avg>=70&& avg<80)
            grade="一般";
        else if (avg>=60&& avg<70)
            grade="及格";
        else
            grade="不及格";
        return  grade;

    }
}
